When considering software upgrades, also consult
and any subsequent advisories to determine exposure and a complete upgrade
These vulnerabilities are first fixed in T27LC SP22 and
T27LB SP21 EP3. For customers who are running T27LC SP22, the client build will
be represented as 27.22SP.0.9253. The fix for customers who are running T27LB
SP21 will be deployed by WebEx over the next few weeks. The client build will
be determined after the software is deployed.
The client build is listed in the Support > Downloads
section of the WebEx page after a user authenticates. WebEx bug fixes are
cumulative in a major release. For example, if release 27.22SP.0 is fixed,
release 27.22SP.1 will also have the software fix.
If a recording player was automatically installed, it will
be automatically upgraded to the latest, nonvulnerable version when users
access a recording file that is hosted on a WebEx server.
If a WebEx recording player was manually installed, users
will need to manually install a new version of the player after downloading the
latest version from